I have a 26 foot high tunnel with a tent stove. Frankly, I have found that composting raised beds do good job of heating it. The stove is for brief, extreme, temperature plunges. I also keep over 100 gallons of water in it.
I figure if someone from the future hasn’t tried to stop me, I can’t be messing up that bad.
I'm thinking solar electric panels would be too inefficient to heat a greenhouse. Solar thermal may be worthwhile but you'd need a lot of them. Better greenhouse design (insulation, passive solar) is probably where I'd start my efforts.
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a humble home and a large garden will erase stress from the rat race